Abstract: A system and method is provided for rendering on a display of an electronic device a pre-corrected image of an original image to compensate for a visual impairment of a user of the device, such that the pre-corrected image when displayed on the display would be perceived by the user to be in better optical focus than the user would perceive a display of the original image. The method includes receiving hardware characteristics of the display, receiving at least one parameter describing the visual impairment of the user, receiving at least one parameter describing the conditions under which the display is seen by the user, calculating a pupil function, calculating a Point Spread Function (PSF), calculating a pre-corrected image corresponding to at least a portion of the original image to compensate for the visual impairment of the user, and rendering on the display the pre-corrected image.

Abstract: A system and method is provided for rendering on a display of an electronic device a pre-corrected image of an original image to compensate for a visual impairment of a user of the device, such that the pre-corrected image when displayed on the display would be perceived by the user to be in better optical focus than the user would perceive a display of the original image. The method includes receiving hardware characteristics of the display, receiving at least one parameter describing the visual impairment of the user, receiving at least one parameter describing the conditions under which the display is seen by the user, calculating a pupil function, calculating a Point Spread Function (PSF), calculating a pre-corrected image corresponding to at least a portion of the original image to compensate for the visual impairment of the user, and rendering on the display the pre-corrected image.

Abstract: To eliminate the acoustic nuisance caused by a ringing of a mobile telephone (1) in a limited geographical zone (7), a device (8) for the transmission of a signal (9) is placed in this zone (7). The decoy signal (9) is obtained by identifying the radioelectric synchronization signal (10), received by a receiver (11), that is the most powerful signal transmitted in this zone (7) and by producing a replica of this synchronization signal (10). This replica is amplified and desynchronized with respect to the received signal (10). Thus a mobile telephone (1) present in this zone (7) considers this decoy signal (9) to be the most powerful one and will therefore get connected with the dummy transmitter (12) that transmits this dummy signal (9). Thus, the production of acoustic nuisance in this zone (7) is avoided.

Abstract: To enable the localizing of a mobile telephone in a network of base transceiver stations, it is planned that the mobile telephone will undertake an exchange with a base transceiver station. In this exchange, this station will send it an absolute time so that the mobile telephone can temporarily locate itself with respect to this absolute time. During this exchange, the first base transceiver station furthermore sends the mobile telephone a piece of information .tau.1 on the distance between them. Then, at least two other base stations send different absolute times which are exploited by the mobile telephone to compute its position in the network by triangulation.